• Oils and Fats Analysis: 31thDGF Proficiency Test 2025

    Organised by the German Society for Fat Science (DGF).

    38 parameters can be tested this year.

    Each laboratory may choose an individual set of parameters from the list below. The execution and the evaluation of the laboratory proficiency test are carried out according to the internationally recognized recommendations "Proficiency Testing of Laboratories" of Codex Alimentarius and ISO.

    List of parameters:

    Quality:

    1. Acid value (Free Fatty Acids)
    2. Peroxid value
    3. Anisidine value
    4. Di- and Polymerized Triacylglycerols Parameter of interest: Di-, tri- and oligomeric triacylglycerols = Sum of dimeric, trimeric and oligomeric tricylglycerols
    5. Total polar compounds
    6. Tocopherols (alpha- Tocopherol, beta-Tocopherol, gamma- Tocopherol and delta- Tocopherol, composition and amount)
    7. Lovibond Colour Index (yellow and red)
    8. CIELAB Colour Index
    9. Gardner Colour Index
    10. Phosphorus
    11. Chromium
    12. Copper
    13. Iron
    14. Lead
    15. Nickel
    16. Smoke point
    17. Water (Karl Fischer)
    18. Hexanal

    Identity:

    19. Iodine value
    20. Saponification value
    21. Butyric acid, quantitative
    22. FAME composition
    23. Triacylglycerol composition (GC-FID)
    24. Sterol composition and amount

    Olive oil and minor compounds:

    25. Stigmastadiene
    26. Alkyl esters (Methyl esters (C16 and C18) and Ethyl esters (C16 and C18))
    27. Pyropheophytin A
    28. Isomeric Diglycerides
    29. K-Values (UV Absorption K232, K270)

    Organic Contaminants

    30. PAH (the most important four acc.to EFSA)
    31. Mineral Oil Hydrocarbons
    32. 2-/3-MCPD/Glycidol
    33. Phthalates
    34. Hexane Isomers, Benzene, Toluene, Ethylbenzene, Xylene
    35. Antioxidants

    Physical properties

    36. Refractive Index (20 °C)
    37. Density (20/20)
    38. Rancimat (120 °C, 10 L/h)

    Matrix

    Sample A: vegetable oil mix, sample B: olive oil and sample, C: used deep-frying oil.
    (150 g each, can be doubled on request)

    Participation Fee:

    450 Euro + VAT
    (a reduced fee of 400 Euro applies for DGF corporate members).

    Double amount of samples: add 70 Euro

    Shipping of Samples:

    add 10 Euro for Germany, 40 Euro for Europe and 100 Euro for World

    Registration:

    Link

    Deadlines:

    Registration: 02.06.2025
    Dispatch of samples: 01.07.2025
    Deadline of reports: 31.10.2025

    For further information please contact:
    (Administration)
    Deutsche Gesellschaft für Fettwissenschaft
    P.O. Box 90 04 40, 60486 Frankfurt/Main, Germany
    Phone +49 (0) 69- 7917 533, Fax +49 (0) 69- 7917 564
    E-Mail schmitt@dgfett.de
    or
    (Scientific questions)
    Dr. Ludger Brühl (DGF division "Analysis, Quality and Product Safety")
    E-Mail: ludger.bruehl@mri.bund.de